It is not your imagination — more people you know are sick this winter, even people who have had flu shots.

Image:macssgroup.com.au

The country is in the grip of three emerging flu or flulike epidemics: an early start to the annual flu season with an unusually aggressive virus, a surge in a new type of norovirus, and the worst whooping cough outbreak in 60 years. And these are all developing amid the normal winter highs for the many viruses that cause symptoms on the “colds and flu” spectrum.

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